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authorJan Kara <jack@suse.cz>2009-03-16 18:27:37 +0100
committerJan Kara <jack@suse.cz>2009-04-02 13:36:28 +0200
commit146bca72c7e6ba52de82a63b1fce7934dc103dbc (patch)
treefee0aff001a5d5226518f0b67232f083f0931209 /fs/udf/ialloc.c
parent40346005166329bc4b53e0c564aff3968c1ddaa0 (diff)
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udf: Don't write integrity descriptor too often
We update information in logical volume integrity descriptor after each allocation (as LVID contains free space, number of directories and files on disk etc.). If the filesystem is on some phase change media, this leads to its quick degradation as such media is able to handle only 10000 overwrites or so. We solve the problem by writing new information into LVID only on umount, remount-ro and sync. This solves the problem at the price of longer media inconsistency (previously media became consistent after pdflush flushed dirty LVID buffer) but that should be acceptable. Report by and patch written in cooperation with Rich Coe <Richard.Coe@med.ge.com>. Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/ialloc.c')
-rw-r--r--fs/udf/ialloc.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index 6eb279d5f4f..c10fa39f97e 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -49,8 +49,7 @@ void udf_free_inode(struct inode *inode)
le32_add_cpu(&lvidiu->numDirs, -1);
else
le32_add_cpu(&lvidiu->numFiles, -1);
-
- mark_buffer_dirty(sbi->s_lvid_bh);
+ udf_updated_lvid(sb);
}
mutex_unlock(&sbi->s_alloc_mutex);
@@ -122,7 +121,7 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
if (!(++uniqueID & 0x00000000FFFFFFFFUL))
uniqueID += 16;
lvhd->uniqueID = cpu_to_le64(uniqueID);
- mark_buffer_dirty(sbi->s_lvid_bh);
+ udf_updated_lvid(sb);
}
mutex_unlock(&sbi->s_alloc_mutex);
inode->i_mode = mode;